Earth Science Unit 6 Plate Tectonics

Evidence of Sea Floor Spreading base on seismograph data

A plate boundary were the two plates are colliding

A feature that is formed at a convergent boundary between two oceanic plates.

The scientist that proposed Seafloor Spreading

The point within the earth where the earthquake starts

Once the friction is released the rocks snap back into their relaxed shape

The way the energy from the earthquake moves away from the point of origin.

The scientist that proposed Plate Tectonics

The scientist that proposed Continental Drift

Evidence for Continental Drift based on remains of plants and animals in separated continents.

A plate boundary where Earthquakes occur

A system of mountains found in the oceans that extends for 70000 km

Waves that travel along the surface of the earth, they are the slowest but most damaging waves

Long curved valleys found along the edges of continents on the ocean floor.

A feature that is formed at a convergent boundary between oceanic and continental plates.

A plate boundary were old crust is being destroyed.

A plate boundary were the two plates are sliding past one another

A cause of hot spots that may not move as the plates do.

A part of the crust that is thicker, but composed of lighter minerals and is less dense.

The tool that scientists use to study earthquakes

Evidence for Continental Drift based on traces of very cold climate in today's warm regions.

A vibration of the lithosphere caused by the release of energy at plate boundaries.

A feature that is formed at a divergent boundary between two oceanic plates.

The thickest part of the interior, made of rocks that are plastic because of heat and pressure

A feature that is formed at a convergent boundary between two continental plates.

Small quakes that precede or follow a major quake that concentrate or release energy.

A cause of plate motion caused by the formation of new crust at divergent plate boundaries.

Waves that travel transverse waves they cause the some damage and middle speed.

Before an earthquake the movement of the plates stores energy by 

A plate boundary were the two plates are separating

Evidence of Sea Floor Spreading from changes in the magnetic field of the earth over time.

A cause of plate motion related to gravity acting on the plates at subduction zones.

A plate boundary where new crust is being created

A cause of plate motion related to the motion of heated material in the mantle

A plate boundary also known as a spreading center.

A part of the crust that is thinner, but composed of heavier minerals and is more dense.

Evidence for Continental Drift found in the matching the shore lines of the continents.

The name of the super continent that existed 200 million years ago

The central part of the interior, made molten and solid nickel and iron.

A plate boundary where crust is not created or destroyed

A plate boundary also known a strike/slip fault

A part of the upper mantel that is very flexible, is allows the plates of crust to side around.

Evidence for Continental Drift based on mountain ranges the same age on separated continents.

A layer of the earth that includes the crust and part of the upper mantle.

When the friction that is resisting the plate motion is overcome the earthquake starts.

The point on the earth's surface above the point where the earthquake starts

Waves that can travel through the interior of the earth

Waves that travel the fastest as longitudinal waves they cause the least damage.

The thin rocky outer layer of the earth

Evidence of Sea Floor Spreading base on old rocks near continents and young rocks near ridges